Zida Zopangira Za Ufa Wobalalitsidwanso wa Latex

Redispersed latex powder (RDP) ndi mtundu wa ufa wa polymer emulsion womwe umagwiritsidwa ntchito kwambiri m'mafakitale omanga monga zomatira za simenti, zodzipangira zokha, komanso kutsekemera kwakunja ndi kutsirizitsa machitidwe. RDPs amapangidwa ndi kupopera mbewu mankhwalawa polima emulsion, amene ndi osakaniza madzi, monoma kapena osakaniza monomers, surfactant, ndi zina zosiyanasiyana. M'nkhaniyi, tikambirana za zipangizo zomwe zimagwiritsidwa ntchito popanga ma RDP.

1. Ma Monomers Ma monomers omwe amagwiritsidwa ntchito popanga ma RDP amatha kusiyanasiyana kutengera zomwe mukufuna pazomaliza. Ma monomers omwe amagwiritsidwa ntchito kwambiri ndi styrene, butadiene, acrylic acid, methacrylic acid, ndi zotumphukira zawo. Rabara ya styrene-butadiene (SBR) ndi yotchuka kwa RDPs chifukwa chomamatira bwino, kukana madzi, komanso kulimba.
2. Ma Surfactants Surfactants amagwiritsidwa ntchito popanga ma RDPs kuti akhazikitse emulsion ndikuletsa coagulation kapena flocculation. Zomwe zimagwiritsidwa ntchito mu RDPs zimaphatikizapo anionic, cationic, ndi nonionic surfactants. Ma anionic surfactants ndi omwe amagwiritsidwa ntchito kwambiri mu RDPs, chifukwa amapereka kukhazikika kwa emulsion komanso kumagwirizana ndi zida za simenti.
3. Stabilizers Stabilizers ntchito kuteteza polima particles mu emulsion ku coalescing kapena aggregating pa yosungirako ndi zoyendera. Zokhazikika zomwe zimagwiritsidwa ntchito mu RDPs zimaphatikizapo polyvinyl alcohol (PVA), hydroxyethyl cellulose (HEC), ndi carboxymethyl cellulose (CMC).
4. Initiators Initiators ntchito kuyambitsa polymerization anachita pakati monomers mu emulsion. Oyambitsa omwe amagwiritsidwa ntchito mu RDPs amaphatikizapo oyambitsa redox, monga potassium persulfate ndi sodium bisulfite, ndi oyambitsa matenthedwe, monga azobisisobutyronitrile.
5. Neutralizing wothandizira Neutralizing wothandizira ntchito kusintha pH wa emulsion kwa mlingo woyenera polymerization ndi bata. Zomwe zimagwiritsidwa ntchito mu RDPs zimaphatikizapo ammonia, sodium hydroxide, ndi potaziyamu hydroxide.
6. Crosslinking agents Crosslinking agents amagwiritsidwa ntchito kuphatikizira maunyolo a polima mu emulsion, zomwe zimatha kukonza makina komanso kukana madzi kwa chinthu chomaliza. Zomwe zimagwiritsidwa ntchito mu RDPs zimaphatikizapo formaldehyde, melamine, ndi urea.
7. Plasticizers Plasticizers amagwiritsidwa ntchito kupititsa patsogolo kusinthasintha ndi kugwira ntchito kwa RDPs. Mapulasitiki omwe amagwiritsidwa ntchito mu RDPs amaphatikizapo polyethylene glycol (PEG) ndi glycerol.
8. Fillers Fillers amawonjezeredwa ku RDPs kuti apititse patsogolo makina awo ndikuchepetsa mtengo. Zodzaza wamba zomwe zimagwiritsidwa ntchito mu RDPs zimaphatikizapo calcium carbonate, talc, ndi silica.
9. Ma Pigment Pigment amawonjezeredwa ku RDPs kuti apereke utoto ndikusintha kukongola kwa chinthu chomaliza. Mitundu yodziwika bwino yomwe imagwiritsidwa ntchito mu RDPs ndi titanium dioxide ndi iron oxide.

Pomaliza, zopangira zomwe zimagwiritsidwa ntchito popanga ma RDP zimatha kusiyanasiyana kutengera zomwe mukufuna pazomaliza. Ma monomers, surfactants, stabilizers, initiator, neutralizing agents, crosslinking agents, plasticizers, fillers, ndi pigment zonse zimagwiritsidwa ntchito popanga RDPs.